mirror of https://github.com/containers/podman.git
63 lines
1.3 KiB
Go
63 lines
1.3 KiB
Go
//go:build linux
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// +build linux
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package vsock
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import (
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"context"
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"github.com/mdlayher/socket"
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"golang.org/x/sys/unix"
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)
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// A conn is the net.Conn implementation for connection-oriented VM sockets.
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// We can use socket.Conn directly on Linux to implement all of the necessary
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// methods.
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type conn = socket.Conn
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// dial is the entry point for Dial on Linux.
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func dial(cid, port uint32, _ *Config) (*Conn, error) {
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// TODO(mdlayher): Config default nil check and initialize. Pass options to
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// socket.Config where necessary.
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c, err := socket.Socket(unix.AF_VSOCK, unix.SOCK_STREAM, 0, "vsock", nil)
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if err != nil {
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return nil, err
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}
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sa := &unix.SockaddrVM{CID: cid, Port: port}
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rsa, err := c.Connect(context.Background(), sa)
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if err != nil {
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_ = c.Close()
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return nil, err
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}
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// TODO(mdlayher): getpeername(2) appears to return nil in the GitHub CI
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// environment, so in the event of a nil sockaddr, fall back to the previous
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// method of synthesizing the remote address.
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if rsa == nil {
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rsa = sa
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}
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lsa, err := c.Getsockname()
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if err != nil {
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_ = c.Close()
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return nil, err
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}
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lsavm := lsa.(*unix.SockaddrVM)
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rsavm := rsa.(*unix.SockaddrVM)
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return &Conn{
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c: c,
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local: &Addr{
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ContextID: lsavm.CID,
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Port: lsavm.Port,
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},
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remote: &Addr{
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ContextID: rsavm.CID,
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Port: rsavm.Port,
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},
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}, nil
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}
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